Convertible bicycle and tandem frame.



PATENTBD. AUG. 11, 1908.

' 0,0. HEDSTROM. CONVERTIBLE BICYCLE AND TANDEM FRAME.

APPLIGATIONFILED MAR.28,1907.

mental frame 01' attachment in place. Fig.

'viewof the foot-rest showing the manner of CARL O. HEDSTROM, OFSPRINGFIELD, MASSACHUSETTS.

CONVERTIBLE BICYCLE AND TANDEM FRAME.

Specification of Letters Patent.

Patented Aug. 1 1, 1908.

Application filed March 28, 1907. Serial No. 365,135.

To all whom it may concern:

Beit known that I, CARL OSCAR HEDsTROM, a citizen of the United Statesof America, residing at Springfield, in the county of Hampden and Stateof Massachusetts, have invented new and useful Improvements inConvertible Bicycle and Tandem Frames, of which the following is aspecification.

My present invention relates to the construction of motor cycles andhas'as a particular object the conversion of an ordinary motor cycleinto a tandem.

It is sometimes very desirable to have an attachment or complementalframe/that can be readily attached to a motor cycle whereby the same canbe converted into a tandem; the complemental frame being rovided with asaddle and front wheel so tliat when the same is substituted for thefront fork of the ordinary motor cycle a' tandem is produced.

Another object is to provide the complemental frame with means forengaging the crank-hanger of themotor cycle; a further obect is toprovide the t'iomplemental frame with a flexible foot-rest and also withmeans to assist in steering the machine.

This invention relates to the construction shown in my prior UnitedStates Letters Patent dated January 29,1907 No. 842,833, to whichreference will be made in the body of the specification.

Further objects of the nature and construction of the invention will befully set forth in the specification.

In the drawings forming part of this application,Figure 1 is a sideelevational View of the motor cycle with the comple- 2 is a plan view ofa detail construction showing the manner of securing the complementalframe to the crank hanger of t 1e motor cycle. Fig. 3 is a sideelevational View of the detail structure shown in Fig. 2, a portion ofthe same being in section. Fig. 4-is a detailed mounting the same in thelower end of the attachment, while Fig. 5 is a perspective view of thefoot-rest detached from the frame.

The framework of an ordinary motor cycle is usually of a diamond shapeconstruction as designated by the reference letter a.

In order to convert the motor eye-h into a tandem it is necessary toprovide some means for lengthening the framework of the Ina-g chlne, andin order to accomplish tlr .result, i

I have found it convenient to replace the ordinary front fork of themachine, which carries the forward wheel, and substitute therefor a com)lemental frame which is provided with a saddle and steering mechanismand is so constructed as to be readily and rigidly secured to thecrank-hanger of the motor frame a.

The complemental frame is rovided with a horizontal bar 7), a brace eement c, and parallel uprights d and e of suitable tubular material.These uprights are further braced and connected by means of thehorizontal cross-bars f, the lower ends of the uprights being connectedby means of the inclined bar g which extends into the horizontal portionh, as clearly shown. This bar g is connected to a steering head '5.

j designates an inclined brace-bar extending between the steering righte.

Mounted within the u )right d is a suitable steering-rod or shaft 75that extends through the steering-head m and the upright d. The detailsof this-construction are clearly shown in my above referred toUnitedStates Letters Patent No. 842,833 and need not be specificallydescribed herein.

The up er end of the upright e of the complemental frame carries asaddle a mounted on. the post 6 in the usual manner.

A suitable pulley or arm n is mounted on' the lower end of the shaft isfor receiving the wire cord 0 that passes under the anti-frietionroller 1) and over the anti-friction roller 1' to another pulley that ismounted on the steering-shaft s of the eompleniental frame anddesignated at t. The two handle-bars u and Q) can therefore move inunison so that each rider can assist in steering the vehicle when inuse.

The bar I) is attached to the crank-hanger portion w of the motor frameby means of the construction shown in Figs. 2 and 3, andis the sameconstruction as that described in detail in Figs. 1, 4, and 5 of myprior patent heretofore referred to.

It will therefore be seen that the tandem or complemental frame can bereadily at tached to and removed from the motor frame a of the motorcycle by merely replacing the usual front fork with the steeringshaft kthat is mounted in the com lemental frame and attaching the horizontabar I) to the. crank-hal'iger w.

Referring to the structure shown in Fig. 4

head 'i and up- 1 ger a; can freely move.

v is constantly elevated;

fringe? in which a detailed view of the foot-rest is shown, andesignates a plunger reciprocally mounted in the upright e and carriesat its upper end a guidingfi'iiston or element y that is secured to the/lunger r'by means of the 'Into the fowcr end of the upright e isthreaded a plug 2 through which the plun- The lower end of the plungeris provided witha head 3 which is :pivotally connected to the foot-lever4 and is pivotally connected to a depending lu 5 on the horizontal parth at the point 6. he forward end of the lever 4 is rovided with pedals7. Mounted between t e lug 2 and the piston y is a coiled spring 8 t ratis normally under compression so that the lever 4 v In order to preventthe head 3 from striking the plug 2, 1 place a buffer spring 9 betweenthe lug 2 and the head 3 which will absorb the blow when the foot isremoved from the pedals 7, as readily understood.

What I claim, is

1. In combination, a bicycle frame, a complemental frame therefor,afoot-rest forming a part of the complemental frame and ineluding atubular upright member as e, a horizontal member as h, a piston locatedin the upright member, a foot-lever pivoted to v the horizontal member,means located between the iston and foot-lever to normally retain saidlever in an elevated position, and means to cushion the foot-lever atthe limit of its upward movement.

2. In combination, a bicycle frame, a complemental frame therefor, afoot-rest mounted thereon and elastic means for exerting an upwardmovement on the foot-rest.

-. 3. In combination, a bicycle frame, acornplemental frame, a foot-restpivoted thereto, and means for cushioning said foot-rest.

4. In combination, a bicycle frame, a complemental frame, a foot-restpivotally connected thereto, a plunger connected to the foot-rest, andelastic means carried by the plunger whereby an upward movement is 1mparted to the foot-rest, as described.

CARL 0-.HEDSTRGM.

Witnesses:

K. I. CLEMoNs, H. W. BOWEN.

